Safety-guard for power-presses.



J. WRIGHT.

SAFETY GUARD FOR POWER PRESSES.

APPLICATION FILED JUNE 30, 1913.

Patented Augz18, 1914.

inventor.

Witnz ssza.

THE NORRIS PETERS c0" PHOTO LITHO., WASHINGTON L). c.

UNITED STATES PATENT OFFICE.

JAMES WRIGHT, OF HAMILTON, ONTARIO, CANADA, ASSIGNOR OF THREE-EIGHTHS T0 WILLIAM SIMPSON STACEY, 0F HAMILTON, ONTARIO, CANADA.

SAFETY-GUARD FOR POWER-PRESSES.

Original application filed July 20, 1912, Serial No. 710,640t1 Specification of Letters Patent.

1913- Serial No. 776,721.

To all whom it may concern:

Be it known that I, J AMES WRIGHT, a subject of the King of Great Britain, and a citizen of the Dominion of Canada, residing at 264 Cannon street east, in the city of Hamilton, in the county of'Wentworth, Province of Ontario, Dominion of Canada, have invented certain new and useful Improvement in Safety-Guards for Power-Presses, of which the following is a specification.

This invention relates to safety guards for power presses and it has more particular reference to stamping press guards which are adapted to prevent injury to the fingers or hands of the operator.

It is well known that presses of the types referred to are usually fitted with a clutchof any appropriate type-interposed between the source of power and the crank or eccentric or other mechanism actuating the reciprocating tool, and means such as a treadle or foot lever are provided for operating said clutch so as to cause the reciprocatory tool to perform its effective stroke, and vice versa to throw said tool out of action when desired. Various safety guards have been heretofore suggested for use in connection, or in conjunction, with the mechanism for throwing the reciprocatory tool into operation to efiectually prevent the said tool being connected to the source of owerupon the operation of the clutch treadle for throwing said tool into actionshould the fingers or hands of any part thereof be in position to be crushed or injured by said tool, or in the event of any hand tool or other foreign body being accidentally placed or left in position to be crushed or touched by said safety guard or tool.

This application is a divisional from my former application which [resulted in the issue of Letters Patent 1067 632, dated July 15, 1913 and is to be construed in conjunction therewith.

The main object of my invention is to provide a safety guard for power presses which acts a a brake on the clutch and automatically and instantly stops the further movement of the reciprocatory tool in the serve to arrest the clutch of the press.

event of any obstruction lying in the path of the protective element during its descent.

With this and other objects in view, as

struction, combination and arrangement of parts hereinafter fully described, illustrated 1n the accompanying drawings forming a part of this specification, and more particularly pointed out in the appended claims.

In the accompanying sheet of drawings, F lgure 1, is a side elevation of my improved brake device. Fig. 2, is a rear view of the same or looking toward the left hand in Fig. 1.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

According to my invention I employ the device shown in Figs. 1, and 2, and which consists of a gravity fall sector 67, adapted to be pivoted at 68, in any appropriate manner to the press frame over the clutch. This sector 67, is slotted to receive the correspondingly shaped web or flange 69, of a slidable block 70, that is movably clamped to said sector by a plate 71. The inner or lower face of the block 70, is transversely notched or provided with teeth 72, which In order to prevent back motion of the sector 67 when in use, I serrate its outer periph eral edge at 73, and hingedly mount a pawl or detent 74, to an outstanding arm or lug 75, on the aforesaid block 70.

76, is a check or look pawl pivoted at 77, to any convenient part of the machine frame, for engagement in a notch 78, at the upper end of the serrated portion 7 3.

79, is an adjusting screw which may be provided with a lock-nut, and it serves for adjusting the sector 67, so as not to interfere normally with the press clutch dog, as Well as for limiting the fall of the said sector 67.

80, is a radially outstanding arm on the block 70, and it is notched out at 81, to be engaged by a toothed piece 82, on the adjacent end of the transverse spindle 39, ar-

ranged above the device as described in my above referred to application. This toothed piece 82, normally supports the sector 67, clear of the clutch and clutch dog, but it Will be readily seen that when the spindle 89, is turned in a clockwise direction said toothed piece is moved away from engagement in the notched out part 81, and the entire sector and its appurtenant parts falls by gravity into operative position. A spring 82, may be attached at one end to the arm 80, and at its other end to any convenient part of the press frame to assist the fall of the sector 67, if deemed necessary.

From the foregoing description the operation of my device will be self evident to those skilled in the art to which it particularly appertains, and it will be readily seen that by my invention I provide an extremely effective and reliable device for the purposes set forth, while at the same time in no way interfering with the utility or efficiency of the press.

Obviously my invention may be readily adapted to any type of stamping press or machine having a reciprocatory tool worked or operated by a clutch release mechanism, as all parts are made relatively adjustable, and I wish it clearly understood that I do not confine myself to the specific arrangement and combination of parts illustrated and described, various alterations in their form and the arrangement thereof being possible without in any Way departing from the spirit and scope of the invention, and it is intended fully to include all such within the present application, and as limited by the appended claims.

Having thus fully described my invention, What I claim as new, and desire to secure by Letters Patent is 1. In a device of the character described,

the combination with a press restraining brake mechanism comprising a gravity actuated toothed member, of an oscillatory shaft, and means carried by said shaft for normally holding said gravity actuated member in an elevated position.

2. In a device of the character described, the combination with a press restraining brake mechanism comprising a gravity actuated toothed member, of an oscillatory shaft, means carried by said shaft for normally holding said gravity actuated member in an elevated position, and

a pawl carried by a fixed portion of the press frame for holding said toothed member in operative position.

3. In a device of the character described, the combination with a press restraining brake mechanism comprising an arcuate slotted member, a toothed block slidably mounted therein, an'oscillatory shaft, and

a member carried by said oscillatory shaft for holding said arcuate member in an elevated position. v

i. In a device of the character described, the combination with press restraining brake mechanism comprising an arcuate slotted member, a toothed block slidably mounted therein, an oscillatory shaft, a member carried by said oscillatory shaft for holding said arcuate member in an elevated position, ratchet teeth formed upon said arcuate member, and a pawl carried by said toothed block and engaging said ratchet teeth.

5. In a press restraining mechanism, the

combination with an arcuate member having its convex edge toothed and having an arcuate slot formed therein, of a toothed block having a mounting in said arcuate slot and having its teeth projected beyond the concave face of said arcuate member and a paWl carried by said block and engaging the toothed convex face of the arcuate member.

6. In a press restraining brake mechanism, the combination with an arcuate member having its convex edge toothed, and having an arcuate slot formed therein, of a toothed block having a mounting in said arcuate slot and having its teeth projected beyond the concave face of said arcuate member, a pawl carried by said block and engaging the toothed convex face of the arcuate member and an extension carried by said block and having an opening formed therein, an oscillatory shaft and a member carried by said shaft and engaging in said opening.

7. In a press restraining brake mechanism, the combination with an arcuate member having its convex face toothed and having an arcuate slot formed therein, of a toothed block having a mounting in said arcuate slot, and having its teeth pro ected beyond the concave face of sa1d arcuate member,

a pawl carried by said block and engaging the toothed convex face of the arcuate mem ber and a spring normally tending to draw said arcuate member into operative position. 7

Wentworth, Province of Ontario, Dominion of Canada, this 23rd day of June, A. D.

JAMES WRIGHT. In the presence of ALFRED T. BRATTON, GERTIE NICHOLSON.

normally tending to draw said arcuate member into operative position and a pivoted pawl carried by the press frame and engaging in a notch formed in said arcuate 5 member to hold said arcuate member in operative position until said pawl is released. Signed at Hamilton, in the county of Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

